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  1. No Access

    Article

    Deep Hard X-ray Survey of the M81 Field Based on INTEGRAL1 Data

    We have carried out a deep survey of the M81 field in the 25–60 keV energy band based on long-term (2003–2023) INTEGRAL observations. A record sensitivity of 0.16 mCrab at a detection significance of ...

    R. A. Krivonos, I. A. Mereminskiy, S. Yu. Sazonov in Astronomy Letters (2024)

  2. No Access

    Article

    Optical Identification and Spectroscopic Redshift Measurements of 216 Galaxy Clusters from the SRG/eROSITA All-Sky Survey

    We present the results of the optical identification and spectroscopic redshift measurements of 216 galaxy clusters detected in the SRG/eROSITA all-sky X-ray survey. The spectroscopic observations were perform...

    I. A. Zaznobin, R. A. Burenin, A. A. Belinski, I. F. Bikmaev… in Astronomy Letters (2023)

  3. No Access

    Article

    SRG/ART-XC Galactic Plane Survey near Galactic Longitude \(\boldsymbol{L\simeq 20^{\circ}}\) : Catalog of Sources

    We present a catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope onboard the SRG space observatory during the observations of the Galactic plane region near a longitude

    D. I. Karasev, A. N. Semena, I. A. Mereminskiy, A. A. Lutovinov… in Astronomy Letters (2023)

  4. No Access

    Article

    X-ray Properties of the Luminous Quasar PG 1634+706 at \(z=1.337\) from SRG and XMM-Newton Data

    In the fall of 2019, during the in-flight calibration phase of the SRG observatory, the onboard eROSITA and Mikhail Pavlinsky ART-XC telescopes carried out a series of observations of PG 1634+706 — one of the ...

    G. S. Uskov, S. Yu. Sazonov, M. R. Gilfanov, I. Yu. Lapshov… in Astronomy Letters (2023)

  5. No Access

    Article

    Selected Active Galactic Nuclei from SRG/eROSITA Survey: Optical and IR Observations in 2021 and 2022 with the 2.5-m Telescope at the Caucasian Mountain Observatory of SAI MSU

    We report the results of optical spectroscopy of eight highly variable X-ray sources—AGN candidates from all-sky survey of the eROSITA telescope of the Spectrum-Roentgen-Gamma Space Observatory—performed with ...

    A. A. Belinski, A. V. Dodin, S. G. Zheltoukhov, K. A. Postnov… in Astrophysical Bulletin (2023)

  6. No Access

    Article

    Optical Identification of Galaxy Clusters among SRG/eROSITA X-ray Sources Based on Photometric Redshift Estimates for Galaxies

    We discuss an algorithm whereby the massive galaxy clusters detected in the SRG/eROSITA all-sky survey are identified and their photometric redshifts are estimated. For this purpose, we use photometric redshif...

    I. A. Zaznobin, R. A. Burenin, A. V. Meshcheryakov, M. R. Gilfanov… in Astronomy Letters (2023)

  7. No Access

    Article

    SRGz: Machine Learning Methods and Properties of the Catalog of SRG/eROSITA Point X-ray Source Optical Counterparts in the DESI Legacy Imaging Surveys Footprint

    We describe the methods of the SRGz system for the physical identification of eROSITA point X-ray sources from photometric data in the DESI Legacy Imaging Surveys footprint. We consider the models included in ...

    A. V. Meshcheryakov, V. D. Borisov, G. A. Khorunzhev, P. A. Medvedev… in Astronomy Letters (2023)

  8. No Access

    Article

    New Active Galactic Nuclei Detected by the ART-XС and eROSITA Telescopes during the First Five SRG All-Sky X-ray Surveys

    We present the results of our identification of 14 X-ray sources detected in the eastern Galactic sky ( \(0^{\circ}<l<180^{\circ}\) ...

    G. S. Uskov, S. Yu. Sazonov, I. A. Zaznobin, R. A. Burenin… in Astronomy Letters (2023)

  9. No Access

    Article

    Search for AGNs in Dwarf Galaxies in the the M81 Field with INTEGRAL Data

    Using long-term INTEGRAL hard X-ray observations, we have put upper limits on the bolometric luminosity ( $$L_{\textrm{bol}}\lesssim 10...

    I. A. Mereminskiy, S. Yu. Sazonov, R. A. Krivonos, I. D. Karachentsev in Astronomy Letters (2023)

  10. No Access

    Article

    Search for Tidal Disruption Events Based on the SRG/eROSITA Survey with Subsequent Optical Spectroscopy

    The four completed six-month sky surveys with the eROSITA telescope onboard the SRG orbital observatory allow tidal disruption events (TDEs) in galactic nuclei to be searched for by their X-ray variability. In...

    G. A. Khorunzhev, S. Yu. Sazonov, P. S. Medvedev, M. R. Gilfanov… in Astronomy Letters (2022)

  11. No Access

    Article

    Highly Variable Active Galactic Nuclei in the SRG/eROSITA Sky Survey: I. The Constriction of a Sample and the Catalog of Objects Detected in a Low State

    We present the results of our search for highly variable active galactic nuclei (AGNs) the X-ray flux from which changed by more than an order of magnitude during the SRG/eROSITA all-sky survey. Using the eROS...

    P. S. Medvedev, M. R. Gilfanov, S. Yu. Sazonov, R. A. Sunyaev… in Astronomy Letters (2022)

  12. No Access

    Article

    Observations of Massive Galaxy Clusters from the All-Sky Survey with the eROSITA Telescope Onboard the SRG Space Observatory

    We present the results of our search for massive galaxy clusters among extended X-ray sources from the SRG/eROSITA survey using data from the Planck survey and data from optical and infrared sky surveys. Optic...

    R. A. Burenin, I. A. Zaznobin, P. S. Medvedev, M. R. Gilfanov… in Astronomy Letters (2022)

  13. No Access

    Article

    SRGe J214919.3+673634—a Candidate for AM Her Variables Discovered by the eROSITA Telescope onboard the Spectrum–Roentgen–Gamma Orbital Observatory

    We present the results of the optical identification, classification, and analysis of our photometric and spectroscopic observations of the X-ray transient SRGe J214919.3+673634 discovered by the eROSITA teles...

    I. F. Bikmaev, A. I. Kolbin, V. V. Shimansky, I. M. Khamitov… in Astronomy Letters (2022)

  14. No Access

    Article

    Search for Pre-Burst Emission from Binary Neutron Star Mergers with Spectrum–Roentgen–Gamma

    Close binary systems consisting of two neutron stars (BNS) emit gravitational waves, that allow them to merge on timescales shorter than Hubble time. It is widely believed, that NS–NS mergers in such systems p...

    I. A. Mereminskiy, A. A. Lutovinov, K. A. Postnov, V. A. Arefiev… in Astronomy Letters (2022)

  15. No Access

    Article

    The X-ray Jets of SS 433 in the Period of Flaring Activity in the Summer of 2018

    We present an analysis of the X-ray data obtained in the period of flaring activity of SS 433 in July and August 2018, during which the brightest radio flares over the entire history of its observations were d...

    P. S. Medvedev, I. I. Khabibullin, A. N. Semena, I. A. Mereminskiy… in Astronomy Letters (2022)

  16. No Access

    Article

    New Active Galactic Nuclei Detected by the ART-XС and eROSITA Telescopes Onboard the SRG Observatory during an All-Sky X-ray Survey

    We present the results of our identification of 17 X-ray sources detected in the 4–12 keV energy range by the Mikhail Pavlinsky ART-XC telescope during the first year of the SRG all-sky survey. Three of them h...

    G. S. Uskov, I. A. Zaznobin, S. Yu. Sazonov, A. N. Semena… in Astronomy Letters (2022)

  17. No Access

    Article

    Search for Distant and X-ray Luminous Quasars during the SRG/eROSITA Sky Survey (the DaLeQo Program). The First Results from Observations at the BTA Telescope

    We discuss the results of our spectroscopy for 17 candidates for distant quasars selected by the SRGz classification system based on data from the first and second sky surveys with the eROSITA telescope onboar...

    G. A. Khorunzhev, S. N. Dodonov, A. V. Meshcheryakov, A. V. Moiseev… in Astronomy Letters (2022)

  18. No Access

    Article

    Estimation of the Mass of the Very Massive Galaxy Cluster SRGe CL2305.2-2248 from Strong Lensing

    SRGe CL2305.2–2248 (SPT-CL J2305–2248, ACT-CL J2305.1–2248) is one of the most massive galaxy clusters at high redshifts ( $$z\simeq 0....

    I. M. Khamitov, I. F. Bikmaev, N. S. Lyskova, A. A. Kruglov… in Astronomy Letters (2022)

  19. No Access

    Article

    Optical Spectroscopy of Quasars Discovered by SRG/eROSITA with a 2.5-m Telescope at the Caucasus Mountain Observatory of SAI MSU

    Based on observations with the transient double-beam spectrograph (TDS) at the 2.5-m telescope of the Caucasus Mountain Observatory of SAI MSU, we have determined the redshifts for 15 new quasars detected in X...

    A. V. Dodin, N. I. Shatsky, A. A. Belinski, K. E. Atapin, M. A. Burlak… in Astronomy Letters (2021)

  20. No Access

    Article

    The Growth Rate of Supermassive Black Holes and Its Dependence on the Stellar Mass of Galaxies at the Present Epoch

    We study the distribution of accretion rates onto supermassive black holes in AGNs of the local Universe ( \(z<0.15\) ...

    S. A. Prokhorenko, S. Yu. Sazonov in Astronomy Letters (2021)

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